net/bluetooth/hci_sysfs.c

   1 /* Bluetooth HCI driver model support. */
   2
   3 #include <linux/kernel.h>
   4 #include <linux/init.h>
   5
   6 #include <net/bluetooth/bluetooth.h>
   7 #include <net/bluetooth/hci_core.h>
   8
   9 struct class *bt_class = NULL;
  10 EXPORT_SYMBOL_GPL(bt_class);
  11
  12 static struct workqueue_struct *bt_workq;
  13
  14 static inline char *link_typetostr(int type)
  15 {
  16         switch (type) {
  17         case ACL_LINK:
  18                 return "ACL";
  19         case SCO_LINK:
  20                 return "SCO";
  21         case ESCO_LINK:
  22                 return "eSCO";
  23         default:
  24                 return "UNKNOWN";
  25         }
  26 }
  27
  28 static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
  29 {
  30         struct hci_conn *conn = dev_get_drvdata(dev);
  31         return sprintf(buf, "%s\n", link_typetostr(conn->type));
  32 }
  33
  34 static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
  35 {
  36         struct hci_conn *conn = dev_get_drvdata(dev);
  37         bdaddr_t bdaddr;
  38         baswap(&bdaddr, &conn->dst);
  39         return sprintf(buf, "%s\n", batostr(&bdaddr));
  40 }
  41
  42 static ssize_t show_link_features(struct device *dev, struct device_attribute *attr, char *buf)
  43 {
  44         struct hci_conn *conn = dev_get_drvdata(dev);
  45
  46         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
  47                                 conn->features[0], conn->features[1],
  48                                 conn->features[2], conn->features[3],
  49                                 conn->features[4], conn->features[5],
  50                                 conn->features[6], conn->features[7]);
  51 }
  52
  53 #define LINK_ATTR(_name,_mode,_show,_store) \
  54 struct device_attribute link_attr_##_name = __ATTR(_name,_mode,_show,_store)
  55
  56 static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
  57 static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
  58 static LINK_ATTR(features, S_IRUGO, show_link_features, NULL);
  59
  60 static struct attribute *bt_link_attrs[] = {
  61         &link_attr_type.attr,
  62         &link_attr_address.attr,
  63         &link_attr_features.attr,
  64         NULL
  65 };
  66
  67 static struct attribute_group bt_link_group = {
  68         .attrs = bt_link_attrs,
  69 };
  70
  71 static const struct attribute_group *bt_link_groups[] = {
  72         &bt_link_group,
  73         NULL
  74 };
  75
  76 static void bt_link_release(struct device *dev)
  77 {
  78         void *data = dev_get_drvdata(dev);
  79         kfree(data);
  80 }
  81
  82 static struct device_type bt_link = {
  83         .name    = "link",
  84         .groups  = bt_link_groups,
  85         .release = bt_link_release,
  86 };
  87
  88 static void add_conn(struct work_struct *work)
  89 {
  90         struct hci_conn *conn = container_of(work, struct hci_conn, work_add);
  91         struct hci_dev *hdev = conn->hdev;
  92
  93         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
  94
  95         if (device_add(&conn->dev) < 0) {
  96                 BT_ERR("Failed to register connection device");
  97                 return;
  98         }
  99
 100         hci_dev_hold(hdev);
 101 }
 102
 103 /*
 104  * The rfcomm tty device will possibly retain even when conn
 105  * is down, and sysfs doesn't support move zombie device,
 106  * so we should move the device before conn device is destroyed.
 107  */
 108 static int __match_tty(struct device *dev, void *data)
 109 {
 110         return !strncmp(dev_name(dev), "rfcomm", 6);
 111 }
 112
 113 static void del_conn(struct work_struct *work)
 114 {
 115         struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
 116         struct hci_dev *hdev = conn->hdev;
 117
 118         if (!device_is_registered(&conn->dev))
 119                 return;
 120
 121         while (1) {
 122                 struct device *dev;
 123
 124                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 125                 if (!dev)
 126                         break;
 127                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 128                 put_device(dev);
 129         }
 130
 131         device_del(&conn->dev);
 132         put_device(&conn->dev);
 133
 134         hci_dev_put(hdev);
 135 }
 136
 137 void hci_conn_init_sysfs(struct hci_conn *conn)
 138 {
 139         struct hci_dev *hdev = conn->hdev;
 140
 141         BT_DBG("conn %p", conn);
 142
 143         conn->dev.type = &bt_link;
 144         conn->dev.class = bt_class;
 145         conn->dev.parent = &hdev->dev;
 146
 147         dev_set_drvdata(&conn->dev, conn);
 148
 149         device_initialize(&conn->dev);
 150
 151         INIT_WORK(&conn->work_add, add_conn);
 152         INIT_WORK(&conn->work_del, del_conn);
 153 }
 154
 155 void hci_conn_add_sysfs(struct hci_conn *conn)
 156 {
 157         BT_DBG("conn %p", conn);
 158
 159         queue_work(bt_workq, &conn->work_add);
 160 }
 161
 162 void hci_conn_del_sysfs(struct hci_conn *conn)
 163 {
 164         BT_DBG("conn %p", conn);
 165
 166         queue_work(bt_workq, &conn->work_del);
 167 }
 168
 169 static inline char *host_typetostr(int type)
 170 {
 171         switch (type) {
 172         case HCI_VIRTUAL:
 173                 return "VIRTUAL";
 174         case HCI_USB:
 175                 return "USB";
 176         case HCI_PCCARD:
 177                 return "PCCARD";
 178         case HCI_UART:
 179                 return "UART";
 180         case HCI_RS232:
 181                 return "RS232";
 182         case HCI_PCI:
 183                 return "PCI";
 184         case HCI_SDIO:
 185                 return "SDIO";
 186         default:
 187                 return "UNKNOWN";
 188         }
 189 }
 190
 191 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 192 {
 193         struct hci_dev *hdev = dev_get_drvdata(dev);
 194         return sprintf(buf, "%s\n", host_typetostr(hdev->type));
 195 }
 196
 197 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 198 {
 199         struct hci_dev *hdev = dev_get_drvdata(dev);
 200         char name[249];
 201         int i;
 202
 203         for (i = 0; i < 248; i++)
 204                 name[i] = hdev->dev_name[i];
 205
 206         name[248] = '\0';
 207         return sprintf(buf, "%s\n", name);
 208 }
 209
 210 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 211 {
 212         struct hci_dev *hdev = dev_get_drvdata(dev);
 213         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 214                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 215 }
 216
 217 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 218 {
 219         struct hci_dev *hdev = dev_get_drvdata(dev);
 220         bdaddr_t bdaddr;
 221         baswap(&bdaddr, &hdev->bdaddr);
 222         return sprintf(buf, "%s\n", batostr(&bdaddr));
 223 }
 224
 225 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 226 {
 227         struct hci_dev *hdev = dev_get_drvdata(dev);
 228
 229         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 230                                 hdev->features[0], hdev->features[1],
 231                                 hdev->features[2], hdev->features[3],
 232                                 hdev->features[4], hdev->features[5],
 233                                 hdev->features[6], hdev->features[7]);
 234 }
 235
 236 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 237 {
 238         struct hci_dev *hdev = dev_get_drvdata(dev);
 239         return sprintf(buf, "%d\n", hdev->manufacturer);
 240 }
 241
 242 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 243 {
 244         struct hci_dev *hdev = dev_get_drvdata(dev);
 245         return sprintf(buf, "%d\n", hdev->hci_ver);
 246 }
 247
 248 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 249 {
 250         struct hci_dev *hdev = dev_get_drvdata(dev);
 251         return sprintf(buf, "%d\n", hdev->hci_rev);
 252 }
 253
 254 static ssize_t show_inquiry_cache(struct device *dev, struct device_attribute *attr, char *buf)
 255 {
 256         struct hci_dev *hdev = dev_get_drvdata(dev);
 257         struct inquiry_cache *cache = &hdev->inq_cache;
 258         struct inquiry_entry *e;
 259         int n = 0;
 260
 261         hci_dev_lock_bh(hdev);
 262
 263         for (e = cache->list; e; e = e->next) {
 264                 struct inquiry_data *data = &e->data;
 265                 bdaddr_t bdaddr;
 266                 baswap(&bdaddr, &data->bdaddr);
 267                 n += sprintf(buf + n, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 268                                 batostr(&bdaddr),
 269                                 data->pscan_rep_mode, data->pscan_period_mode,
 270                                 data->pscan_mode, data->dev_class[2],
 271                                 data->dev_class[1], data->dev_class[0],
 272                                 __le16_to_cpu(data->clock_offset),
 273                                 data->rssi, data->ssp_mode, e->timestamp);
 274         }
 275
 276         hci_dev_unlock_bh(hdev);
 277         return n;
 278 }
 279
 280 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 281 {
 282         struct hci_dev *hdev = dev_get_drvdata(dev);
 283         return sprintf(buf, "%d\n", hdev->idle_timeout);
 284 }
 285
 286 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 287 {
 288         struct hci_dev *hdev = dev_get_drvdata(dev);
 289         char *ptr;
 290         __u32 val;
 291
 292         val = simple_strtoul(buf, &ptr, 10);
 293         if (ptr == buf)
 294                 return -EINVAL;
 295
 296         if (val != 0 && (val < 500 || val > 3600000))
 297                 return -EINVAL;
 298
 299         hdev->idle_timeout = val;
 300
 301         return count;
 302 }
 303
 304 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 305 {
 306         struct hci_dev *hdev = dev_get_drvdata(dev);
 307         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 308 }
 309
 310 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 311 {
 312         struct hci_dev *hdev = dev_get_drvdata(dev);
 313         char *ptr;
 314         __u16 val;
 315
 316         val = simple_strtoul(buf, &ptr, 10);
 317         if (ptr == buf)
 318                 return -EINVAL;
 319
 320         if (val < 0x0002 || val > 0xFFFE || val % 2)
 321                 return -EINVAL;
 322
 323         if (val < hdev->sniff_min_interval)
 324                 return -EINVAL;
 325
 326         hdev->sniff_max_interval = val;
 327
 328         return count;
 329 }
 330
 331 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 332 {
 333         struct hci_dev *hdev = dev_get_drvdata(dev);
 334         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 335 }
 336
 337 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 338 {
 339         struct hci_dev *hdev = dev_get_drvdata(dev);
 340         char *ptr;
 341         __u16 val;
 342
 343         val = simple_strtoul(buf, &ptr, 10);
 344         if (ptr == buf)
 345                 return -EINVAL;
 346
 347         if (val < 0x0002 || val > 0xFFFE || val % 2)
 348                 return -EINVAL;
 349
 350         if (val > hdev->sniff_max_interval)
 351                 return -EINVAL;
 352
 353         hdev->sniff_min_interval = val;
 354
 355         return count;
 356 }
 357
 358 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 359 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 360 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 361 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 362 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 363 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 364 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 365 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 366 static DEVICE_ATTR(inquiry_cache, S_IRUGO, show_inquiry_cache, NULL);
 367
 368 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 369                                 show_idle_timeout, store_idle_timeout);
 370 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 371                                 show_sniff_max_interval, store_sniff_max_interval);
 372 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 373                                 show_sniff_min_interval, store_sniff_min_interval);
 374
 375 static struct attribute *bt_host_attrs[] = {
 376         &dev_attr_type.attr,
 377         &dev_attr_name.attr,
 378         &dev_attr_class.attr,
 379         &dev_attr_address.attr,
 380         &dev_attr_features.attr,
 381         &dev_attr_manufacturer.attr,
 382         &dev_attr_hci_version.attr,
 383         &dev_attr_hci_revision.attr,
 384         &dev_attr_inquiry_cache.attr,
 385         &dev_attr_idle_timeout.attr,
 386         &dev_attr_sniff_max_interval.attr,
 387         &dev_attr_sniff_min_interval.attr,
 388         NULL
 389 };
 390
 391 static struct attribute_group bt_host_group = {
 392         .attrs = bt_host_attrs,
 393 };
 394
 395 static const struct attribute_group *bt_host_groups[] = {
 396         &bt_host_group,
 397         NULL
 398 };
 399
 400 static void bt_host_release(struct device *dev)
 401 {
 402         void *data = dev_get_drvdata(dev);
 403         kfree(data);
 404 }
 405
 406 static struct device_type bt_host = {
 407         .name    = "host",
 408         .groups  = bt_host_groups,
 409         .release = bt_host_release,
 410 };
 411
 412 int hci_register_sysfs(struct hci_dev *hdev)
 413 {
 414         struct device *dev = &hdev->dev;
 415         int err;
 416
 417         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 418
 419         dev->type = &bt_host;
 420         dev->class = bt_class;
 421         dev->parent = hdev->parent;
 422
 423         dev_set_name(dev, "%s", hdev->name);
 424
 425         dev_set_drvdata(dev, hdev);
 426
 427         err = device_register(dev);
 428         if (err < 0)
 429                 return err;
 430
 431         return 0;
 432 }
 433
 434 void hci_unregister_sysfs(struct hci_dev *hdev)
 435 {
 436         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 437
 438         device_del(&hdev->dev);
 439 }
 440
 441 int __init bt_sysfs_init(void)
 442 {
 443         bt_workq = create_singlethread_workqueue("bluetooth");
 444         if (!bt_workq)
 445                 return -ENOMEM;
 446
 447         bt_class = class_create(THIS_MODULE, "bluetooth");
 448         if (IS_ERR(bt_class)) {
 449                 destroy_workqueue(bt_workq);
 450                 return PTR_ERR(bt_class);
 451         }
 452
 453         return 0;
 454 }
 455
 456 void bt_sysfs_cleanup(void)
 457 {
 458         destroy_workqueue(bt_workq);
 459
 460         class_destroy(bt_class);
 461 }